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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e4277b2def04763363c9ad82a3fa7ba7e954b67b0ba9df742850f289889fa0' 
  AND token = '9ee5lCi6fA2LC6JHUN5l1V2msY5IN3CKWmeDleneLsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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