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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16354017961876e7e1e11c7b2f759018f74458f28a31e6d959390093cfaaa21e' 
  AND token = '7SmI8ygNMzXtC9uAow42QDfFF5pQE8oUUPVEp5W2ark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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