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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0e4b227f3f7f2df24c224079c15de70f2265b6e0ef8a6f45676a10374e4aac' 
  AND token = '0gfv7k1H8vdSipEWdjsaiogq6NKInPjH/S/NkqIDZ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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