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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eacbc2d428b22d83e23c14434d961a0ff3b996084246d7b25be971cae85e747' 
  AND token = 'KzU7OuwNcwAZgohsoEqFCdhg9iYeonJP4PGsh3dUA8U=' 
  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"
    }
  }
}