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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b813d150517d6e3c5da845415d2b4d16ffd3788e9d9f8642cad87c25d3433a' 
  AND token = 'xkmmDW45cKQd+IbVg505Q2aObMWcjKyOTOmiZ4MGWOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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