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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9265d9df66c946616488a1369564931fd184fffa817f5005710f9eeccbe1029' 
  AND token = 'ycZc4+iUQXIvor6FyjKN3DIvBCS/YATlhO4VkpD/yd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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