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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9137f1a9a99ad3db922de17d917e31c2e06eaefabd1933bd0b1a3a96f8ea9cc4' 
  AND token = 'vZUwJQRfES+9iXAUJ4hrGUXIaJLcOQkqHQ9+R7lrrrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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