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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cebfec392fd6d91856475897aa8b55c68734fd32b378820640dc37df3c24c4' 
  AND token = 'giEY9Es/OwLaNT16A7rqvr6I/4kuY/bkTRMKEDL6HqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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