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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1f6ac3e86939279ca4870d0a208756757e3c0ea43781a7273344702cf7e6a0' 
  AND token = '32xRJpHC+FOYS654rsto7eGkhS5po+F99205lWJZ9yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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