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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a558d7b4751b88653bc8e08594a053ae34de9b6a4a17a5da2c996ac0777cb09' 
  AND token = 'nmrZyL3PHMaU/JTV2gJR2RCTLYldH/Q7aOB04bcGa/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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