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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dedec26316340106536f6cc77421f5ab250467ab3576bdc55073d0c12a7bac' 
  AND token = 'HZrEpi7MfBBHHhsucGzfCo3snCm4BsRK3sBPc4a7RMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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