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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da19fa70a9fa3b8212867a7355f45b21b7fb8a83189d87476e2419c7308fca3a' 
  AND token = '4irgKhnpEc6U/Ba4OAFQ4DvbtGwKE7uMM5t0qLh5FQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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