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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116c73eda94443d71facc131526a4103e836c95f43aa4f9f9fdc1020295973bf' 
  AND token = 'NpLyq9zfuMKZF8nmXM2r/YRp0p2ZJS5fV48yj6onqJM=' 
  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"
    }
  }
}