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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec36e93e31b44dbb4a07dea5ba64e0e5616ac044bbf3b148b01872f454a0e43a' 
  AND token = '/xqXNsqrClqnpEXm5et23lvvNB2YZ7dW1PTAaaKFrPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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