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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a2b7e2d288350e587f1dc2cc2287f29a18de0bc4abb36a99d0640ae2887d2' 
  AND token = 'pKIYHL8P4L80VOIdYJd5k2LoQMB/p6qm/afkrUacH8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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