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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52007aafd9c08ecb9f19e067439bd12b64b028cdc42a2ddca1cb84f90d8547c' 
  AND token = 'iLSfBI0k80XztEd3lEDYJI1wlxcUz0/RZUhRdtn3xGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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