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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ea67e12876750eb0ad6a2a9cb7b82858ade0506a417952c6e27b8e76a2afbc' 
  AND token = '5WEG/0WlRXZ21gWoILDAYMwh3/5W91WBkYUXbczu7FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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