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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5dcd5a46d0ce3f16639867e5a5619fbb1318ed9becb64b39bf84f81b819c98' 
  AND token = 'LU8Fx+7utTMsNE9wp2oA9xvWSqOVSwGWM1BNdq837tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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