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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc62ab00f3f6580ba631fc52873af6ef40a3aa4f26e9a4f179d395b90f04d3d5' 
  AND token = 'zFHXzQs4g4DwXCXp2iGkav5fxshpeK0EvWKde00piJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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