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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06328259b84e0e387e52e861cb4b54605c1b15c8dbea7bde655bf2a3f999fc65' 
  AND token = '5+ulYZyUM/+EFXm1qNZlBQe1b58uF7Q+eUsJZ8BaouA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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