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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c9410e3c6ad158fdae0d62d8fdb863c3bcef151fa02271c661d369290cb9f7' 
  AND token = '/PeU9ctIUa0tfuOf7a/uosUPNG3JoK4tP9abxYCD6oE=' 
  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"
    }
  }
}