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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b45ba16b84f1102988c57980246bee49dd155dceec80f2c9efba18d6b18c93' 
  AND token = 'LjCcbKjnP3hiDn4QSU9M7SnS6zjCN6t2ilKxmUTJTcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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