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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af54a27918056b8d0c4f954b507071bea7a41f86ea7f31e0092467de2a272369' 
  AND token = 'qUMCu5R6h4cUJRd6dFqw4F0vnj/jUJujwXSrbMe6qi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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