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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8cce442fef1e3d7b1ab422031091b049b885a905f28df1c4731a3444a00598' 
  AND token = 'wX3s4l9H5bviieE2/vTMyLmE96BmDXGjO6/KNsaLI9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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