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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a32d268b903aab95ed89b301e8a39ad98d1518494e1d9bcc22ab603c3c683a' 
  AND token = 'eauhiUxcg916INhJJV2IJO8JN+ExgIpD1ZLV4id1Ef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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