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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b593280bea42f8fb4a474417766fbab9bac894f32e7d2d1186ac7e7d9be057' 
  AND token = 'k0390XuvSojUWw8DjDt7n2hZB2+u03Av2nA6Kq8tLjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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