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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad49972e13f34219698d4ccc38bb9c58429008ffb79d51a4b0e0587660b889be' 
  AND token = 'DJQE6yupScI6KvP1gFyiNLHLXhzpH3Gwba+EEd205Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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