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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4084168662fb2ba6828da0f7dfd6b8ab819be91986c75e5a2c39fab30b095312' 
  AND token = 'fReIGBq6OY/JBJgX2Um82WG8QgSW3/fbpR9WUH025aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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