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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05bf0c0e27ab12a7da8af142062812240596844c26373b9ba9e4e1edb913dd4' 
  AND token = 'L6iAlmSzvEexg/1i9zMUnbz9x/RHpo4dMe38UdNu6b0=' 
  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"
    }
  }
}