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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41149c7c6b46206952b6694215c45cec6813ec80b29fc7e00c45f99e549263db' 
  AND token = 'FhpRXWFOHhH4Auj4la01/cyvGMs/E+F1GTEuSaF2OjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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