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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cb75063e3298e8e884c08510c58b732263fffc3fb31f3cb7d8a7d625cc5c4e' 
  AND token = 'Kvvj7gSPSHOEbCYN9l5sRIO/N56CzakACxzW+6kL1Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}