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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1cbb9552772d6c3f23efb9a68b17ff3f0f16a775455d03ed7c9b723e5961c1' 
  AND token = 's09kxobeFSAViYD8Y6dgIUZuQW8pJrp2bkRC94+wFhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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