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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759a41f028e496101a3f7249bcb82fb3b8ef9e5f934e645a23e04a5ba2b793ba' 
  AND token = 'cNY2kQp7adJu6PrJqbF4gybWoWQNw5/hOSnrLyBAyfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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