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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba1c56ba81435a50c4b9be3e07e7acf61310189b8e1d6dd0be2456eb69c547a' 
  AND token = '0CdJ6v31dHbAHcTk6ARd6fA6cMqAWjZroLT3IU8bfSQ=' 
  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"
    }
  }
}