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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01fa31031531b39ea3fb977c196ee26c41f05e954beefa8952b263be37dbef5' 
  AND token = 'jktP4R8LWTXZi6O7rFliwc/4YPcT1cQY0VnRgzm4u6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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