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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0a3eeb3a28cf9e7386d2156c6dc804c96046b300f317f5fc9d4fc6b4f5cc7a' 
  AND token = '9sORdFu3v1lHfRFkCvrkC6B3P6K/2ycFpl9q7EkRAwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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