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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae6b0a54e6355e89f4e23064245d7799f7a28206b204bf5de67f26794b9d4e0' 
  AND token = 'Zlf/asl+ebyfpoFP/ByRiSC+GEKO5Ws8lf4xQQV16lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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