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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95954fd10ce17f1e00415ae5f6bbc773ebd9751ab5ffba5e8bda12489acecf4' 
  AND token = '5jZf5o96YyVKHhlgeSh+h4Pp6+xVsrZfKZ1tvg3DJMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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