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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446c4540660328a60cd000eb550f11140c1cf305021e19ea36d4d5100a0647d0' 
  AND token = 'h8Uplg6tZB9YdB8VCFXqAAF9/selIBmkeWOkt9KtLQQ=' 
  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"
    }
  }
}