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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42c2fd2957145d60a180d82696112d783b7bf7e1c0dc27dae5b025d8fd9bf93' 
  AND token = 'zxLwaDlJ+tipw52Xkup9/AbRfBe7Aupv7xkgWqpb46w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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