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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da85fd2abfcbbc85d5fefd8cf8334a44b104d065e58fe9c8f9796452eb78029' 
  AND token = 'gHilE2cTP/noT3TmDQKi335aYZ9LKZRdGJ8SsvuKtYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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