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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd396c4662ae0a632964637018903f21ed454a184d689f3c6c0e0f0bbd890236' 
  AND token = 't4cQ0F/ntiOFFSvvmBjYed+GFVC76Ei42bq8jfi6EoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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