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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16c71e92d36414b0c61a43dd0b472792d3c7a5ef2c1fd6277a5f8e022592ffe' 
  AND token = 'sxDxlWcXRrovXBgA6V+2e4qjfBMIjcNMz8oIVQfP6SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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