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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad09e59f3f614d3500e435a1f9fa450ae3322b3b1ddb1f5805426303ea28421' 
  AND token = 'AmtWAJHJZXgAQlFu0Um3wmqS1XqUcKTKkZDYQWZqygA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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