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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bb0a6216a7a3d3aa0f1f40ec2b0e32d3b41de2160c23174deab20aecfc450a' 
  AND token = 'DI9yT+EyTTk6ACs1tkTNP/H24fkhAvcZFUTVDGGIX1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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